Heliodor (Yellow Beryl)
Beryl (Be3Al2Si6O18 with iron impurities)
gemstone
Category
Mineral (Pseudomorph)
Browse mineral (pseudomorph) specimens identified by the Rock Identifier community.
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Leopard Skin Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Sandstone (River Cobble)
Clastic Sandstone (SiO2 with accessory minerals)
sedimentary
Sandstone
Arenite (SiO2 based with mineral cement)
sedimentary
Copper Ore (likely Malachite or Chrysocolla staining)
Copper Secondary Mineral (e.g., Cu2CO3(OH)2)
mineral
Basalt River Pebble (with possible Pyrite/Mineralization)
Basalt (Mafic volcanic rock)
igneous
Green Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Milky quartz (likely)
Quartz, silicon dioxide (SiO₂)
mineral
Weathered sandstone or tuff fragment
Likely quartz-rich sandstone (SiO₂) or porous volcanic tuff; exact identification requires testing
sedimentary
Granite
Intrusive igneous rock
igneous
Ammonite Fossil
Ammonoidea subclass (calcium carbonate / silica replacement)
fossil
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock pebble
sedimentary
Banded Sandstone / Siltstone
Sedimentary Rock (Quartzose Sandstone / Siltstone)
sedimentary
Greenstone / Greenschist
Greenschist (contains chlorite, epidote, actinolite)
metamorphic
Fossil Shark Tooth
Lamniformes (order) - likely Cretalamna or Carcharias species
fossil
Vesicular Basalt with Calcification
Vesicular Basalt (Aphanitic extrusive igneous rock)
igneous
Metallic Ornament / Jewelry
N/A - This is an artificial object, not a geological specimen.
This appears to be a man-made metallic object, likely jewelry, not a natural rock, mineral, or geological specimen.
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossilized Dinosaur Skull (Tyrannosaurus rex)
Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica
sedimentary
Fossilized Shark Tooth
Fossilized elasmobranch tooth (Apatite/Calcium Phosphate)
sedimentary
Dinosaur Fossil (Tyrannosaurus rex skull replica/specimen)
Tyrannosaurus rex (fossilized in permineralized sedimentary matrix)
sedimentary
Pegmatite
Igneous Pegmatite
igneous
Basalt (Vesicular/Weathered)
Mafic Igneous Rock (Mainly Plagioclase and Pyroxene)
igneous
Rounded iron-rich pebble
Likely hematite/goethite-bearing quartzite or ironstone; exact identification requires testing
mineral
Small quartz-rich rock fragment (tentative)
Quartz, silicon dioxide (SiO₂), possibly in a feldspar-bearing granite fragment
mineral
Howlite
Howlite (Ca2B5SiO9(OH)5)
mineral
Eudialyte in Matrix
Na15Ca6(Fe,Mn)3Zr3(Si,Nb)(Si25O73)(O,OH,H2O)3(Cl,OH)2
mineral
Garnet (Almandine)
Almandine Fe3Al2(SiO4)3
mineral
Amazonite
Amazonite (KAlSi3O8 - Microcline)
mineral
Quartzite River Rock with Dendrites
Metamorphosed Quartz-rich Sandstone with Manganese Oxide (MnO2) inclusions
metamorphic
Honeycomb Calcite
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Polished tiger’s-eye
Chatoyant quartz, mainly fibrous crocidolite pseudomorphed by quartz (SiO₂)
mineral
Vesicular Basalt (Scoria)
Basalt (Extrusive Igneous Rock)
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite and Porphyry Pebbles
Intrusive Igneous Rock
igneous
Granite
Phaneritic Igneous Rock
igneous
Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Porphyritic Basalt or Lamprophyre
Extrusive igneous rock with visible phenocrysts
igneous
Beach Pebble (Quartzite / Sandstone)
Quartz-rich sedimentary or metamorphic rock pebble
sedimentary
Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Granite
Intrusive Igneous Rock (composed mainly of quartz, alkali feldspar, and plagioclase)
igneous